*{margin: 0;padding: 0;}
.section1{
	width: 100%;
	height:600px;
    background-color:#f2f2f3;
	}
    #dd_scroll{ 
        width: 1510px;
        height: 600px;
        position:relative;
        display:flex;
        margin: 0px auto;
        }
    ul{list-style: none;}
    .section1 li{
        width: 10px;
        height: 10px;
        background-color: #fff;
        border: 1px solid#ccc;
        display: inline-block;
        cursor: pointer;
        border-radius: 5px 5px 5px 5px;
        position: relative;
        left: 50%;
    }
    .section1 li:hover {
        background-color: red;
        color: #fff;
      }